A Predator-Prey Model for Dynamics of Cognitive Radios

Cognitive radio technology is well known to enhance spectrum utilization via opportunistic transmission at link level. However, the time dynamics of spectrum utilization among primary system users and secondary cognitive radio users in such cognitive radio networks remain unknown at this time. We note that the system behavior is very similar to interaction among different species coexisting in an ecosystem. Therefore, we take advantage of well-known predator-prey model, in which two species of predators species model, representing heterogeneous users, are fed by the preys, representing the communication resources. By analyzing the population dynamics in the spectrum-sharing ecosystem, we could analyze the transient behavior of the CRs and develop efficient ways to assess the stability of the CR system.